Freescan is great. I also use Scanner Recorder: It's great for recording unattended.
"Scanner Recorder provides a switched recorder that listens to the sound coming into the audio card and if the sound is above the minimum threshold, the recorder operates. If the sound level falls below the threshold, the recorder pauses.
Since the recorder starts and stops based on what it hears, Scanner Recorder incorporates an anti-clipping feature that keeps the very beginning of the audio that breaks the squelch threshold from being clipped off. The result is that when sound is played back, there is no noticeable "click". Also the beginning of the audio event is not clipped off (like mechanical vox recorders do).
The program has a VOX control that allows the you to save disk space when no sound is present in the signal."
Download Scanner Recorder (Scanrec) 1.9 Free - An audio recorder that is primarily designed to record speech. - Softpedia